Question: Who was the head of government of the Czech Republic on January 1st, 1993?
Paraphrase: Who became the head of the Czech Republic in 1993?
SPARQL (Wikidata): SELECT ?obj WHERE { wd:Q213 p:P6 ?s . ?s ps:P6 ?obj . ?s pq:P580 ?x filter(contains(YEAR(?x),'1993')) }